Treasury Minister Liz Truss risks sparking controversy by visiting the Washington offices of the right-wing group later today - where she is expected to face questions over whether she supports the radical plan.

The Department for International Trade have distanced themselves from the draft agreement, saying they had no hand in it.

A spokesman added: “We are currently seeking a wide range of views about four potential free trade agreements, including with the USA, and we encourage all interested organisations and members of the public to make their voices heard through our online consultations.”